Numbers 35:13-15

35:13 These towns that you must give shall be your six towns for refuge.

35:14 “You must give three towns on this side of the Jordan, and you must give three towns in the land of Canaan; they must be towns of refuge. 35:15 These six towns will be places of refuge for the Israelites, and for the foreigner, and for the settler among them, so that anyone who kills any person accidentally may flee there.